All you need is this structure:

Foo-Bar-0.01/Bar.pm
Foo-Bar-0.01/Makefile.PL
Foo-Bar-0.01/MANIFEST
Foo-Bar-0.01/Changes
Foo-Bar-0.01/test.pl
Foo-Bar-0.01/README
Foo-Bar-0.01/Bar/Baz.pm

# in Bar.pm
package Foo::Bar;

# in Baz.pm
package Foo::Bar::Baz;

# in Makefile.PL
WriteMakefile(
    'NAME' => 'Foo::Bar',
[download]

cheers

tachyon

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